driving your son and wife away from the hospital is really important to me. >> reporter: compare that to pictures of his grandmother, the queen, released as part of a new baby book, all buttoned-up formality. these are the unbuttoned royals who are changed by becoming parents. >> i think the last few weeks have been a very emotional experience. something i never thought i would feel myself. and i find, again, a lot of things affect me differently now. >> reporter: the young royals can try to behave like any other family in the park, but of course, they're not. william insists he is normal in another way, though. he says he can't wait to get back to work so he can get some sleep. >> he's a little bit of a rascal, let's put it that way, so he kind of reminds me of me or my brother, i'm not sure. >> reporter: these first photos were not taken by a society photographer, but by kate's father, michael middleton.